<script setup lang="ts">
import { ref } from 'vue'
import { useIntersectionObserver } from '@vueuse/core'

const props = withDefaults(
  defineProps<{
    loading?: boolean
    finished?: boolean
  }>(),
  {
    loading: false,
    finished: false
  }
)

const emit = defineEmits<{
  (e: 'infinite'): void
}>()

const target = ref(null)
useIntersectionObserver(
  target,
  ([{ isIntersecting }]) => {
    if (isIntersecting) {
      if (props.loading === false && props.finished === false) {
        emit('infinite')
      }
    }
  },
  {
    threshold: 0
  }
)
</script>

<script lang="ts">
export default {
  name: 'infinite-loading'
}
</script>
<template>
  <div class="infinite-loading" ref="target">
    <div class="loading" v-if="loading">
      <span class="img"></span>
      <span class="text">正在加载...</span>
    </div>
    <div class="none" v-if="finished">
      <span class="img"></span>
      <span class="text">亲，没有更多了</span>
    </div>
  </div>
</template>

<style lang="less" scoped>
.infinite-loading {
  .loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 50px;
      height: 50px;
      background: url('/src/assets/images/load.gif') no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
  .none {
    background-color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    .img {
      width: 200px;
      height: 134px;
      background: url('/src/assets/images/none.png') no-repeat center / contain;
    }
    .text {
      color: #999;
      font-size: 16px;
    }
  }
}
</style>
